The TrustZone driver in Huawei P9 phones with software Versions earlier than EVA-AL10C00B352 and P9 Lite with software VNS-L21C185B130 and earlier versions and P8 Lite with software ALE-L02C636B150 and earlier versions has an input validation vulnerability, which allows attackers to cause the system to restart.
http://www.securityfocus.com/bid/94509
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20161123-01-smartphone-en